Well whether it's for sentimental reasons, or just coz you can't help yourself. What tunes with a less favourable reputation do you actually secretly love?
I have a soft spot for David Guetta - Titanium I just like it, not entirely sure why.
On another note Capella - Move it up, cheesy shallow Eurotrance, reminds me of my younger days, but I even have it in my iTunes to this day.